Back for a chair or an armchair



FIG. 1 is a perspective view of the back of a chair or an armchair. The chair itself which is not part of this invention is shown in dotted lines;

FIG. 2 is a front elevational view of the back of the chair, the top part being concave with respect to the remaining portion of the back;

FIG. 3 is the rear elevational view of the back of the chair, the top part being convex with respect to the remaining portion of the back;

FIG. 4 is the right side view of the back of the chair, the left side being the mirror image;

FIG. 5 is a top plan view of the back of the chair; and,

FIG. 6 is the bottom plan view of the back of the chair. 

The ornamental design for a back for a chair or an armchair, as shown and described. 